Building wall construction

ABSTRACT

There is provided an improved building wall construction including a thermal expansion type split mullion. The mullion includes a continuous face member against which opposed panels are glazed with glazing tape as the seam end weathering. This eliminates the seam between the mullion halves from the exterior face of the mullion assembly altogether, protecting the seam from the weather, and reducing the vulnerable sealing lines exposed to the weather.



1. A longitudinally split expansion mullion for supporting a pair of panels aligned in a common plane in side-by-side relation, said mullion comprising: a first elongated element of generaLly T-shaped cross section including an outer cross member and a leg integrally joined to said cross member intermediate opposite longitudinal edges thereof; and a second elongated element telescopically received within said first element and of generally L-shaped cross section having a first leg parallel to and movable toward and away from said leg of said first element, and an integral flange along the inner edge of said first leg away from said cross member extending toward said leg of said first element; said first element including an integral flange along the inner longitudinal edge of said leg extending outward of and toward said first leg of said second element and in adjustable juxtaposition with said flange of said first element forming an inner wall portion of said mullion parallel to said cross member; said first leg formed with an outer longitudinal edge terminating short of said cross member and adjustable toward and away from said leg of said first element, so that said cross member extends transversely beyond said outer longitudinal edge whereby no outer visible joints exist between said elements; each of said legs being formed with an outwardly opening, longitudinally extending recess intermediate its opposite longitudinal edges and a stop retaining toe extending longitudinally along at least one edge of the recess for retaining engagement with a panel securing stop member.
 2. The mullion of claim 1 in combination with at least one stop member including a lip along one longitudinal edge engageable with said stop retaining toe in said recess and including a stop surface parallel to the adjacent inside surface of said cross member for retaining an edge portion of a panel therebetween. 